Answer:
: a compound (such as guanosine or adenosine) that consists of a purine or pyrimidine base combined with deoxyribose or ribose and is found especially in DNA or RNA
Explanation: Succession is a series of progressive changes in the composition of an ecological community over time. In primary succession, newly exposed or newly formed rock is colonized by living things for the first time.
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All organisms are made of cells
all existing cells are produced by other living cells
the cell is the most basic unit of life
Melanin provides pigmentation to the skin and it also provides UV ray protection (which is its role in the epidermis).